$\left(x+2\right)\left(x-5\right)+x\left(x-3\right)$
$a\:\left(x\right)\:+\:b\:\left(x\right)$
$\:c\:+\:-22\:=\:16$
$\left(cotx\:-cscx\right)\left(cosx+1\right)$
$\:\:\left(2x+5z^2\right)\left(2x-5z^2\right)$
$-x^2+6x-13$
$f\left(x\right)=\:\tan\pi x$
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